Recent ensemble forecasts from the China Meteorological Administration and global models such as GFS converge on a daily maximum near 26°C for Chongqing on May 18, with the basin topography trapping heat despite variable low-level moisture and light southerly flow that limits afternoon mixing. The closely matched market-implied odds around 25–27°C reflect genuine uncertainty in cloud-cover timing and boundary-layer development, as modest shifts in these variables can swing the peak by 1–2°C. Historical May climatology shows typical highs of 25–27°C for this date range, providing a stable baseline against which current model runs are weighed. Fresh observational data and updated guidance expected within the next 24–48 hours will refine these probabilities ahead of resolution.